[ns] NS Extension Quesion

Hello all,

I'm fairly new at extending ns2, but I have a specific problem I am
working on. I have a dumbbell topology as follows:

8 7 12 2 3
\ | \ | /
9 -- 1 ----- 0 -- 4
/ | | \
10 11 6 5

Where nodes 2, 3, 4, 5, and 6 are sending to 7, 8, 9, 10 and 11,
respectively. What I want to do is that for every 5 seconds I want to
sample a packet from 0 and send it to 12 for inspection. I was looking
at the ns2 manual and I figured the easiest way to do this is by
creating a routing module very similar to the base module except it
would duplicate a packet every 5 seconds and send it to 12. Is there an
easier way to do this? If this is the best way to do it, how would I go
about making my own routing module for this purpose? The manual was
fairly cryptic about this, and this seems like an easy task. Also, when
12 receives a packet I wanted it to do some computation then send a
message back to 0. I figured I would just create an agent that does
this. Is that the way to go about it? The transport protocol between
12 and 0 are mostly irrelevant here. Thanks for your help in advance.

--
Eric Heim
Graduate Student
University of Pittsburgh
Computer Science Department
Office: 5324 Sennot Square
Website: www.cs.pitt.edu/~eth13